once, more than 40 years ago, during the vietnam war. >> this was a very deliberate, well-planned, well-executed attack by the taliban. they created chaos and mayhem on a base that should have been more secure and this should not have happened. >> reporter: and late this evening, another incident that's causing tension here. nato is confirming that an air strike has led to civilian casualties reportedly including afghan women and children. david? >> many fast-moving developments there. muhammad lila, thank you. and, as you heard him report there, prince harry is serving at that afghanistan base. of course, we don't know if harry was the target, if his presence even played a role in why they attacked there. but it was a very public deployment and so we wanted to know why make it so public? we bring in abc's martha raddatz, and, martha, how rare is this? >> reporter: david, this is really highly unusual. remember, the last time the prince was deployed in 2008, it was done in secret. when it leaked, he went back to britain early because he didn't want his presence to endanger others.